diff options
Diffstat (limited to 'drivers/gpu/drm/tiny/ili9225.c')
| -rw-r--r-- | drivers/gpu/drm/tiny/ili9225.c | 470 |
1 files changed, 470 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tiny/ili9225.c b/drivers/gpu/drm/tiny/ili9225.c new file mode 100644 index 000000000000..c66acc566c2b --- /dev/null +++ b/drivers/gpu/drm/tiny/ili9225.c @@ -0,0 +1,470 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * DRM driver for Ilitek ILI9225 panels + * + * Copyright 2017 David Lechner <david@lechnology.com> + * + * Some code copied from mipi-dbi.c + * Copyright 2016 Noralf Trønnes + */ + +#include <linux/delay.h> +#include <linux/dma-buf.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/property.h> +#include <linux/spi/spi.h> +#include <video/mipi_display.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_damage_helper.h> +#include <drm/drm_drv.h> +#include <drm/drm_fb_cma_helper.h> +#include <drm/drm_fb_helper.h> +#include <drm/drm_fourcc.h> +#include <drm/drm_gem_cma_helper.h> +#include <drm/drm_gem_framebuffer_helper.h> +#include <drm/drm_mipi_dbi.h> +#include <drm/drm_rect.h> +#include <drm/drm_vblank.h> + +#define ILI9225_DRIVER_READ_CODE 0x00 +#define ILI9225_DRIVER_OUTPUT_CONTROL 0x01 +#define ILI9225_LCD_AC_DRIVING_CONTROL 0x02 +#define ILI9225_ENTRY_MODE 0x03 +#define ILI9225_DISPLAY_CONTROL_1 0x07 +#define ILI9225_BLANK_PERIOD_CONTROL_1 0x08 +#define ILI9225_FRAME_CYCLE_CONTROL 0x0b +#define ILI9225_INTERFACE_CONTROL 0x0c +#define ILI9225_OSCILLATION_CONTROL 0x0f +#define ILI9225_POWER_CONTROL_1 0x10 +#define ILI9225_POWER_CONTROL_2 0x11 +#define ILI9225_POWER_CONTROL_3 0x12 +#define ILI9225_POWER_CONTROL_4 0x13 +#define ILI9225_POWER_CONTROL_5 0x14 +#define ILI9225_VCI_RECYCLING 0x15 +#define ILI9225_RAM_ADDRESS_SET_1 0x20 +#define ILI9225_RAM_ADDRESS_SET_2 0x21 +#define ILI9225_WRITE_DATA_TO_GRAM 0x22 +#define ILI9225_SOFTWARE_RESET 0x28 +#define ILI9225_GATE_SCAN_CONTROL 0x30 +#define ILI9225_VERTICAL_SCROLL_1 0x31 +#define ILI9225_VERTICAL_SCROLL_2 0x32 +#define ILI9225_VERTICAL_SCROLL_3 0x33 +#define ILI9225_PARTIAL_DRIVING_POS_1 0x34 +#define ILI9225_PARTIAL_DRIVING_POS_2 0x35 +#define ILI9225_HORIZ_WINDOW_ADDR_1 0x36 +#define ILI9225_HORIZ_WINDOW_ADDR_2 0x37 +#define ILI9225_VERT_WINDOW_ADDR_1 0x38 +#define ILI9225_VERT_WINDOW_ADDR_2 0x39 +#define ILI9225_GAMMA_CONTROL_1 0x50 +#define ILI9225_GAMMA_CONTROL_2 0x51 +#define ILI9225_GAMMA_CONTROL_3 0x52 +#define ILI9225_GAMMA_CONTROL_4 0x53 +#define ILI9225_GAMMA_CONTROL_5 0x54 +#define ILI9225_GAMMA_CONTROL_6 0x55 +#define ILI9225_GAMMA_CONTROL_7 0x56 +#define ILI9225_GAMMA_CONTROL_8 0x57 +#define ILI9225_GAMMA_CONTROL_9 0x58 +#define ILI9225_GAMMA_CONTROL_10 0x59 + +static inline int ili9225_command(struct mipi_dbi *dbi, u8 cmd, u16 data) +{ + u8 par[2] = { data >> 8, data & 0xff }; + + return mipi_dbi_command_buf(dbi, cmd, par, 2); +} + +static void ili9225_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect) +{ + struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0); + struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(fb->dev); + unsigned int height = rect->y2 - rect->y1; + unsigned int width = rect->x2 - rect->x1; + struct mipi_dbi *dbi = &dbidev->dbi; + bool swap = dbi->swap_bytes; + u16 x_start, y_start; + u16 x1, x2, y1, y2; + int idx, ret = 0; + bool full; + void *tr; + + if (!dbidev->enabled) + return; + + if (!drm_dev_enter(fb->dev, &idx)) + return; + + full = width == fb->width && height == fb->height; + + DRM_DEBUG_KMS("Flushing [FB:%d] " DRM_RECT_FMT "\n", fb->base.id, DRM_RECT_ARG(rect)); + + if (!dbi->dc || !full || swap || + fb->format->format == DRM_FORMAT_XRGB8888) { + tr = dbidev->tx_buf; + ret = mipi_dbi_buf_copy(dbidev->tx_buf, fb, rect, swap); + if (ret) + goto err_msg; + } else { + tr = cma_obj->vaddr; + } + + switch (dbidev->rotation) { + default: + x1 = rect->x1; + x2 = rect->x2 - 1; + y1 = rect->y1; + y2 = rect->y2 - 1; + x_start = x1; + y_start = y1; + break; + case 90: + x1 = rect->y1; + x2 = rect->y2 - 1; + y1 = fb->width - rect->x2; + y2 = fb->width - rect->x1 - 1; + x_start = x1; + y_start = y2; + break; + case 180: + x1 = fb->width - rect->x2; + x2 = fb->width - rect->x1 - 1; + y1 = fb->height - rect->y2; + y2 = fb->height - rect->y1 - 1; + x_start = x2; + y_start = y2; + break; + case 270: + x1 = fb->height - rect->y2; + x2 = fb->height - rect->y1 - 1; + y1 = rect->x1; + y2 = rect->x2 - 1; + x_start = x2; + y_start = y1; + break; + } + + ili9225_command(dbi, ILI9225_HORIZ_WINDOW_ADDR_1, x2); + ili9225_command(dbi, ILI9225_HORIZ_WINDOW_ADDR_2, x1); + ili9225_command(dbi, ILI9225_VERT_WINDOW_ADDR_1, y2); + ili9225_command(dbi, ILI9225_VERT_WINDOW_ADDR_2, y1); + + ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_1, x_start); + ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_2, y_start); + + ret = mipi_dbi_command_buf(dbi, ILI9225_WRITE_DATA_TO_GRAM, tr, + width * height * 2); +err_msg: + if (ret) + dev_err_once(fb->dev->dev, "Failed to update display %d\n", ret); + + drm_dev_exit(idx); +} + +static void ili9225_pipe_update(struct drm_simple_display_pipe *pipe, + struct drm_plane_state *old_state) +{ + struct drm_plane_state *state = pipe->plane.state; + struct drm_crtc *crtc = &pipe->crtc; + struct drm_rect rect; + + if (drm_atomic_helper_damage_merged(old_state, state, &rect)) + ili9225_fb_dirty(state->fb, &rect); + + if (crtc->state->event) { + spin_lock_irq(&crtc->dev->event_lock); + drm_crtc_send_vblank_event(crtc, crtc->state->event); + spin_unlock_irq(&crtc->dev->event_lock); + crtc->state->event = NULL; + } +} + +static void ili9225_pipe_enable(struct drm_simple_display_pipe *pipe, + struct drm_crtc_state *crtc_state, + struct drm_plane_state *plane_state) +{ + struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev); + struct drm_framebuffer *fb = plane_state->fb; + struct device *dev = pipe->crtc.dev->dev; + struct mipi_dbi *dbi = &dbidev->dbi; + struct drm_rect rect = { + .x1 = 0, + .x2 = fb->width, + .y1 = 0, + .y2 = fb->height, + }; + int ret, idx; + u8 am_id; + + if (!drm_dev_enter(pipe->crtc.dev, &idx)) + return; + + DRM_DEBUG_KMS("\n"); + + mipi_dbi_hw_reset(dbi); + + /* + * There don't seem to be two example init sequences that match, so + * using the one from the popular Arduino library for this display. + * https://github.com/Nkawu/TFT_22_ILI9225/blob/master/src/TFT_22_ILI9225.cpp + */ + + ret = ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0000); + if (ret) { + DRM_DEV_ERROR(dev, "Error sending command %d\n", ret); + goto out_exit; + } + ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0000); + ili9225_command(dbi, ILI9225_POWER_CONTROL_3, 0x0000); + ili9225_command(dbi, ILI9225_POWER_CONTROL_4, 0x0000); + ili9225_command(dbi, ILI9225_POWER_CONTROL_5, 0x0000); + + msleep(40); + + ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0018); + ili9225_command(dbi, ILI9225_POWER_CONTROL_3, 0x6121); + ili9225_command(dbi, ILI9225_POWER_CONTROL_4, 0x006f); + ili9225_command(dbi, ILI9225_POWER_CONTROL_5, 0x495f); + ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0800); + + msleep(10); + + ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x103b); + + msleep(50); + + switch (dbidev->rotation) { + default: + am_id = 0x30; + break; + case 90: + am_id = 0x18; + break; + case 180: + am_id = 0x00; + break; + case 270: + am_id = 0x28; + break; + } + ili9225_command(dbi, ILI9225_DRIVER_OUTPUT_CONTROL, 0x011c); + ili9225_command(dbi, ILI9225_LCD_AC_DRIVING_CONTROL, 0x0100); + ili9225_command(dbi, ILI9225_ENTRY_MODE, 0x1000 | am_id); + ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0000); + ili9225_command(dbi, ILI9225_BLANK_PERIOD_CONTROL_1, 0x0808); + ili9225_command(dbi, ILI9225_FRAME_CYCLE_CONTROL, 0x1100); + ili9225_command(dbi, ILI9225_INTERFACE_CONTROL, 0x0000); + ili9225_command(dbi, ILI9225_OSCILLATION_CONTROL, 0x0d01); + ili9225_command(dbi, ILI9225_VCI_RECYCLING, 0x0020); + ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_1, 0x0000); + ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_2, 0x0000); + + ili9225_command(dbi, ILI9225_GATE_SCAN_CONTROL, 0x0000); + ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_1, 0x00db); + ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_2, 0x0000); + ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_3, 0x0000); + ili9225_command(dbi, ILI9225_PARTIAL_DRIVING_POS_1, 0x00db); + ili9225_command(dbi, ILI9225_PARTIAL_DRIVING_POS_2, 0x0000); + + ili9225_command(dbi, ILI9225_GAMMA_CONTROL_1, 0x0000); + ili9225_command(dbi, ILI9225_GAMMA_CONTROL_2, 0x0808); + ili9225_command(dbi, ILI9225_GAMMA_CONTROL_3, 0x080a); + ili9225_command(dbi, ILI9225_GAMMA_CONTROL_4, 0x000a); + ili9225_command(dbi, ILI9225_GAMMA_CONTROL_5, 0x0a08); + ili9225_command(dbi, ILI9225_GAMMA_CONTROL_6, 0x0808); + ili9225_command(dbi, ILI9225_GAMMA_CONTROL_7, 0x0000); + ili9225_command(dbi, ILI9225_GAMMA_CONTROL_8, 0x0a00); + ili9225_command(dbi, ILI9225_GAMMA_CONTROL_9, 0x0710); + ili9225_command(dbi, ILI9225_GAMMA_CONTROL_10, 0x0710); + + ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0012); + + msleep(50); + + ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x1017); + + dbidev->enabled = true; + ili9225_fb_dirty(fb, &rect); +out_exit: + drm_dev_exit(idx); +} + +static void ili9225_pipe_disable(struct drm_simple_display_pipe *pipe) +{ + struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev); + struct mipi_dbi *dbi = &dbidev->dbi; + + DRM_DEBUG_KMS("\n"); + + /* + * This callback is not protected by drm_dev_enter/exit since we want to + * turn off the display on regular driver unload. It's highly unlikely + * that the underlying SPI controller is gone should this be called after + * unplug. + */ + + if (!dbidev->enabled) + return; + + ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0000); + msleep(50); + ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0007); + msleep(50); + ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0a02); + + dbidev->enabled = false; +} + +static int ili9225_dbi_command(struct mipi_dbi *dbi, u8 *cmd, u8 *par, + size_t num) +{ + struct spi_device *spi = dbi->spi; + unsigned int bpw = 8; + u32 speed_hz; + int ret; + + gpiod_set_value_cansleep(dbi->dc, 0); + speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 1); + ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, cmd, 1); + if (ret || !num) + return ret; + + if (*cmd == ILI9225_WRITE_DATA_TO_GRAM && !dbi->swap_bytes) + bpw = 16; + + gpiod_set_value_cansleep(dbi->dc, 1); + speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num); + + return mipi_dbi_spi_transfer(spi, speed_hz, bpw, par, num); +} + +static const struct drm_simple_display_pipe_funcs ili9225_pipe_funcs = { + .enable = ili9225_pipe_enable, + .disable = ili9225_pipe_disable, + .update = ili9225_pipe_update, + .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb, +}; + +static const struct drm_display_mode ili9225_mode = { + DRM_SIMPLE_MODE(176, 220, 35, 44), +}; + +DEFINE_DRM_GEM_CMA_FOPS(ili9225_fops); + +static struct drm_driver ili9225_driver = { + .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, + .fops = &ili9225_fops, + .release = mipi_dbi_release, + DRM_GEM_CMA_VMAP_DRIVER_OPS, + .name = "ili9225", + .desc = "Ilitek ILI9225", + .date = "20171106", + .major = 1, + .minor = 0, +}; + +static const struct of_device_id ili9225_of_match[] = { + { .compatible = "vot,v220hf01a-t" }, + {}, +}; +MODULE_DEVICE_TABLE(of, ili9225_of_match); + +static const struct spi_device_id ili9225_id[] = { + { "v220hf01a-t", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(spi, ili9225_id); + +static int ili9225_probe(struct spi_device *spi) +{ + struct device *dev = &spi->dev; + struct mipi_dbi_dev *dbidev; + struct drm_device *drm; + struct mipi_dbi *dbi; + struct gpio_desc *rs; + u32 rotation = 0; + int ret; + + dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL); + if (!dbidev) + return -ENOMEM; + + dbi = &dbidev->dbi; + drm = &dbidev->drm; + ret = devm_drm_dev_init(dev, drm, &ili9225_driver); + if (ret) { + kfree(dbidev); + return ret; + } + + drm_mode_config_init(drm); + + dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(dbi->reset)) { + DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n"); + return PTR_ERR(dbi->reset); + } + + rs = devm_gpiod_get(dev, "rs", GPIOD_OUT_LOW); + if (IS_ERR(rs)) { + DRM_DEV_ERROR(dev, "Failed to get gpio 'rs'\n"); + return PTR_ERR(rs); + } + + device_property_read_u32(dev, "rotation", &rotation); + + ret = mipi_dbi_spi_init(spi, dbi, rs); + if (ret) + return ret; + + /* override the command function set in mipi_dbi_spi_init() */ + dbi->command = ili9225_dbi_command; + + ret = mipi_dbi_dev_init(dbidev, &ili9225_pipe_funcs, &ili9225_mode, rotation); + if (ret) + return ret; + + drm_mode_config_reset(drm); + + ret = drm_dev_register(drm, 0); + if (ret) + return ret; + + spi_set_drvdata(spi, drm); + + drm_fbdev_generic_setup(drm, 0); + + return 0; +} + +static int ili9225_remove(struct spi_device *spi) +{ + struct drm_device *drm = spi_get_drvdata(spi); + + drm_dev_unplug(drm); + drm_atomic_helper_shutdown(drm); + + return 0; +} + +static void ili9225_shutdown(struct spi_device *spi) +{ + drm_atomic_helper_shutdown(spi_get_drvdata(spi)); +} + +static struct spi_driver ili9225_spi_driver = { + .driver = { + .name = "ili9225", + .owner = THIS_MODULE, + .of_match_table = ili9225_of_match, + }, + .id_table = ili9225_id, + .probe = ili9225_probe, + .remove = ili9225_remove, + .shutdown = ili9225_shutdown, +}; +module_spi_driver(ili9225_spi_driver); + +MODULE_DESCRIPTION("Ilitek ILI9225 DRM driver"); +MODULE_AUTHOR("David Lechner <david@lechnology.com>"); +MODULE_LICENSE("GPL"); |